Science/Strand III/Content Standard 1/High School/Benchmark 1
Benchmark Question: How do multi-cellular organisms
grow, based on how cells grow and reproduce?
Focus Question: Why are multi-cellular organisms
made of many small cells instead of one large cell?
The teacher will give
students potato cubes of different sizes (3 cm, 2 cm, 1 cm) to soak in
iodine (Lugal’s solution) overnight. The next day they should remove the
cubes from the iodine and slice them in half to show how far the iodine
entered the cube. Students should write an explanation that associates this
movement of iodine with the movement of essential materials moving in and
out of a cell. The explanation should include these ideas:
1. The smaller the cell, the more efficient the movement
of materials is for the whole cell.
2. The more efficient the movement of materials is for
the whole cell, the more efficient the cell becomes.